206155692137 has 2 divisors, whose sum is σ = 206155692138. Its totient is φ = 206155692136.

The previous prime is 206155692109. The next prime is 206155692139. The reversal of 206155692137 is 731296551602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171446511721 + 34709180416 = 414061^2 + 186304^2 .

It is a cyclic number.

It is not a de Polignac number, because 206155692137 - 2²⁰ = 206154643561 is a prime.

Together with 206155692139, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 206155692091 and 206155692100.

It is not a weakly prime, because it can be changed into another prime (206155692139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103077846068 + 103077846069.

It is an arithmetic number, because the mean of its divisors is an integer number (103077846069).

Almost surely, 2^206155692137 is an apocalyptic number.

It is an amenable number.

206155692137 is a deficient number, since it is larger than the sum of its proper divisors (1).

206155692137 is an equidigital number, since it uses as much as digits as its factorization.

206155692137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 680400, while the sum is 47.

The spelling of 206155692137 in words is "two hundred six billion, one hundred fifty-five million, six hundred ninety-two thousand, one hundred thirty-seven".